For Questions , use the following narrative
Narrative: Classes 1 and 2
Suppose a 95% confidence interval for the difference in test scores between Class 1 and Class 2 (in that order) is the following: 9 +/− 2.These results were based on independent samples of size 100 from each class.
-{Classes 1 and 2 narrative} Suppose you switch the order of Class 1 and Class 2 in your analysis but you keep the data labeled correctly in terms of which class they came from.Which of the following statements is false?
A)You are confident that the average for Class 2 is 7 to 11 points lower than for Class 1.
B)Your 95% confidence interval will now be entirely negative: from −7 to −11.
C)You can't do it this way.You'll get negative numbers for the difference in the means and/or negative numbers for the standard error.
D)You are still confident that the classes have significantly different mean scores.

Question

Quizplus · Accepted Answer

Switching the order of Class 1 and Class 2 in the analysis changes the sign of the difference but does not affect the ability to calculate differences in means or standard errors. Negative numbers for differences are expected and valid in this context.

For Questions , Use the Following Narrative